[tz] Proposal to revert 2023b's Lebanon data changes

[Howard Hinnant]

I’m not a Microsoft representative, however I do have data to add to such a discussion.

The C++20 language specification incorporates the IANA database into the C++ standard library.  On all platforms but Windows this is a fairly light weight lift because said platforms already ship with the IANA database.  Microsoft representatives agreed to this change in C++ and have implemented it by taking advantage of the IANA database that ships with ICU, which in turn ships on the latest Windows platforms.

The C++20 spec also has a “current time zone” function which must translate the Windows currently set time zone into an IANA time zone identifier.

I mention all this to reinforce Rich’s observation for the need for synchronization between these databases and to bring to attention additional motivations for such synchronization.

Howard

On Mar 27, 2023, at 4:35 PM, Rich Armstrong via tz <tz at iana.org> wrote:
> 
> Though this list usually doesn't include discussion of the time-zone-rule data that Microsoft maintains in the Windows registry, it seems worth considering how to ensure the two repositories of time-zone rules might be kept in sync regarding the recent time change(s) in Lebanon-not to mention IATA's repository. Thoughts and opinions from any MS representatives would be welcome.